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Consider the following statements associated with an electromagnetic wave in free space:
Which of the above statements are correct?
Thus, statements1 and 4 are only correct.
Intrinsic impedance or charcteristic impedance of the nonconducting medium in the free space is
Intrinsic impedance or characteristic impedance of the nonconducting medium in free space is given as
If the magnitude of in a plane wave is 1 V/m, what is the magnitude of H for a plane wave in free space?
We know that,
What is the velocity of a plane wave in a lossless medium having a relative permittivity of 5 and relative permeability of unity?
Velocity of propagation is given by
A plane wave in free space has an average Poynting vector of 1 Wm^{2}. The average energy density is
Poynting vector P= EH and total energy density W= μH^{2}.
Infree space are respectively given by and The value of β and H_{0} are respectively
This is a plane wave.
For plane wave in space,
In a homogeneous nonconducting region where The value of ∈_{r} and ω are
Looking at the phase we can find that direction of propagation is +z.
Since must also lie in a + z direction, A must have the direction
Assertion (A): Uniform plane electromagnetic waves are transverse in nature.
Reason (R): Uniform plane electromagnetic
waves have components of only in direction perpendicular to the direction of propagation and not in the direction of propagation.
Assertion (A): The term is sometimes referred to the loss tangent.
Reason (R): The two vectors J_{c} (conduction current density) and J_{d} (displacement current density) are 180° out of phase and are in the opposite direction in space.
which indicates that the two vectors J_{c} and J_{d} are out of phase in time and are in the same direction in the space. Hence, reason is not a correct statement.
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